diff --git a/pkgs/development/python-modules/pybase64/default.nix b/pkgs/development/python-modules/pybase64/default.nix
index 6a141484bb4b..d52a1f67d214 100644
--- a/pkgs/development/python-modules/pybase64/default.nix
+++ b/pkgs/development/python-modules/pybase64/default.nix
@@ -1,9 +1,11 @@
-{ buildPythonPackage, stdenv, fetchPypi, six, pytest }:
+{ buildPythonPackage, isPy3k, stdenv, fetchPypi, six, pytest }:
 
 buildPythonPackage rec {
   pname = "pybase64";
   version = "1.0.1";
 
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "6ced40531bffc81bafc790d5c0d2f752e281b3b00fd6ff4e79385c625e5dbab1";